Authors: Zhanquan Zhang Jun Xiao Lei Dai Yingying Wang DongQing Wang Xinmei Liu Zifeng Yan
Publish Date: 2011/07/24
Volume: 19, Issue: 4, Pages: 473-479
Abstract
Mesostructured aluminosilicates MCM41 with ordered 2dimensional hexagonal structure were successfully synthesized via the alkalitreatment step and nanocrystal aluminosilicates assembly in the basic and hydrothermal synthesis conditions by sol–gel approach Highly hydrothermally stable MCM41 coupled with large surface area and pore volume is desirable To find out the optimum conditions An orthogonal experiment L1643 with three factors and four levels was adopted and the effects were also discussed Various techniques including Xray diffraction XRD N2 adsorptiondesorption temperature program desorption and fourier transform infrared spectroscopy were used to monitor the physical–chemical properties of MCM41 When the synthesis was operated under 80 °C lasting 1 h with CNaOH 05 mol/L and molar ratio of CTAB to ZSM5 015 the synthesized MCM41 possessed high specific surface area 1150 m2/g large pore volume 123 cm3/g with appropriate acid distribution as well as highly hydrothermal stability In addition the results reveal that the assynthesized samples have a uniform phase without MFI structure Samples have a 5membered ring in the framework and have a better hydrothermal stability than the conventional AlMCM41 Performance evaluation was carried out on a 20 mL fixedbed hydrorefining unit with the Daqing FCC diesel as feedstock The sulfur and nitrogen removal is 993 and 996 respectively while the cetane number was increased by 54
Keywords: